AutoCodes – GMC – P22A5 2016 GMC Sierra

P22A5 2016 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit High Voltage

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P22A5 2016 GMC Sierra indicates NOx Sensor 2 Heater Control Circuit High Voltage.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor 2, Nitrogen Oxides Sensor 2 harness is open or shorted, Nitrogen Oxides Sensor 2 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 221

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P22A5 2016 GMC Sierra Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P22A5 2016 GMC Sierra - NOx Sensor 2 Heater Control Circuit High Voltage - AutoCodes.com — P22A5 2016 GMC Sierra Code - NOx Sensor 2 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P22A5 2016 GMC Sierra?

Faulty Nitrogen Oxides (NOx) Sensor 2
Nitrogen Oxides Sensor 2 harness is open or shorted
Nitrogen Oxides Sensor 2 circuit poor electrical connection

How to Fix the DTC P22A5 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P22A5 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P22A5 2016 GMC Sierra code?

Need more information on how to fix the P22A5 2016 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P22A5 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

The common symptoms include the check engine light turning on, reduced engine performance, and potentially increased emissions.

2. What typically causes the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

The code P22A5 is often triggered by a malfunction in the NOx sensor 2 heater control circuit, which can be caused by wiring issues, a faulty sensor, or an issue with the vehicle's ECM.

3. How can I diagnose the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

Diagnosis involves using an OBDII scanner to retrieve the code, inspecting the wiring and connections related to the NOx sensor 2 heater, and testing the sensor's functionality.

4. Can I continue driving my 2016 GMC Sierra with the OBDII code P22A5 related to NOx Sensor 2 Heater Control Circuit High Voltage?

It is not recommended to continue driving with this code present, as it can lead to increased emissions, reduced engine performance, and potential long-term damage if left unresolved.

5. What are the repair options for fixing the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

Repair options include checking and repairing any damaged wiring, replacing the NOx sensor 2 heater if faulty, or addressing any issues with the ECM that may be causing the code.

6. Is it safe to reset the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage on my own?

While you can reset the code with an OBDII scanner, it's crucial to diagnose and address the underlying issue causing the code to prevent further problems.

7. How much does it typically cost to repair the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $500 for parts and labor.

8. Are there any preventative maintenance tips to avoid encountering the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

Regularly inspecting and maintaining the NOx sensors, wiring, and related components can help prevent issues that may trigger this code.

9. Can a DIY enthusiast with some automotive knowledge repair the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

Depending on the individual's skills and tools available, some DIY enthusiasts may be able to diagnose and repair this issue themselves, but it's recommended to seek professional help if unsure.

10. How urgent is it to address the OBDII code P22A5 in a 2016 GMC Sierra related to NOx Sensor 2 Heater Control Circuit High Voltage?

It is advisable to address this code promptly to prevent potential damage to the vehicle, ensure optimal engine performance, and maintain compliance with emissions regulations.